After months of training and preparation, Andy and his wife Fay join a small group of intrepid explorers to try to reach the summit of Mount Kilimanjaro in Tanzania. As the only mountain in the world that you can walk up, the ascent will take at least four days of intense walking. The start point is above the height of Mount Snowdon and whilst they start in dense rain forest, surrounded by the local wildlife, that soon gives way to alpine scenery and then more arid conditions.

Assisted by an experienced group of sherpas and guides, they edge ever higher and closer to their goal. As conditions on the climb become more and more challenging and they leave the cloud layer below them, so the effects of altitude sickness start to have a significant impact on members of the group.

The final ascent to the summit is timed to watch the sunrise but is an intense and grueling challenge during which Andy starts to become affected by the lack of oxygen. Whether he can make it to the summit is in question, and even if he does, how will he make it back down?